campbell



2 SheetsSheet 1. (No Model.) H. H. MPBELL,

INOLINED GRATE. No. 403,416. Patented May 14, 1889.

WITNESSES 7 I WNM- 7; Wa w 4 Attorney.

N. PETERS. Phowumo m mr. wnhin wn. n. C.

(No Model.) 2 Sheets-Sheet 2.

H. H. CAMPBELL.

INCLINED GRA'IE.v

No. 403,416. Patented May 14, 1889-.

WITNESSES IWWTOA m3 7 W dyffiy @forneys HENRY II. CAMPBELL, OF CLEVELAND, OIIIO, ASSIGNOR OF ONE-HALF TO NATHAN \V. TAYLOR, OF SAME PLACE.

INCLINED GRATE.

SPECIFICATION forming part of Letters Patent No. 403,416, dated May 14, 1889.

7 Application filed May 25,1888- Serial No. 275,032. (No model.)

To all whom it may concern:

Be it known that I, HENRY H. CAMPBELL, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Inclined Grates; and I do hereby declare the following to be a full,

. clear, and exact description of the invention,

v and to which reference is made.

such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in inclined grates having shelves for supporting the coal, in which such shelves are detachable from the respective grate-sections, to the end that any of the shelves that have been wasted by the action of the heat or injured from any cause may be removed and their places supplied with new shelves and without disturbing other portions of the grate.

My invention is intended as an improveprovement on what is known as the Brightman grate, for which United States Letters Patent N 0. 318,862 were granted May 26, 1885, With the Brightman grate the shelves on which the coal rested were cast integral with the supporting grate-sections. These grates being inclined, the lower ends thereof, where the greatest depth of coal was had, were exposed to the greatest heat, and consequently the lower shelves and the exposed ends of the supporting grate-sections were soon burned away, necessitating the frequent renewal of the entire grate-sections.

As an improvement I provide removable shelves held in place by gravity, any one of which shelves may be removed and its place supplied with a new shelf without disturbing the other parts of the grate or grates; also,- the lower shelves are provided with depending lips that respectively overlap and protect the lower ends of the supporting grate-sections.

In the accompanying drawings, Figures 1 and 4 are plans, respectively, of stationary and reciprocating grate sections with the shelves removed. Figs. 2 and 3 are side elevations in longitudinal section through the center of the respective grate-sections. Figs. 5 and 6 are views in perspective showing the two varieties of shelves. Figs. 7 and 8 are plans, each showing an assemblage of grates, and hereinafter described. Fig. 9 is a side elevation.

The general arrangement of the grates is substantially the same as shown and described in the Brightman patent aforesaid,in which stationary and reciprocating grate-sections, respectively, A and A alternate, the stationary grate-sections having suitable seats near the ends thereof for' engaging, respectively, the stationary cross-bars on which these grate-sections rest, and the reciprocating grate-sections having seats farther from the ends for engaging, respectively, the oscillating cross-bars on which these movable gratesections rest. Each grate-section is cast in halves, the division-line being on a vertical plane lengthwise of the grate-sections, the mechanism thus far described being the same as in the Brightman patent.

WVith my improved construction each half of a grate-section, and on the inner face thereof, is provided with a series of ribs, (1., and when the two halves of a section are bolted or riveted together the ribs abut each other, leaving pockets a, opening upward, in which pockets the depending shanks or lugs b of the shelves B are inserted. The casting of the grate-sections in halves is not essential, as the pockets to might be cored in; but such practice would be more expensive than casting the grate-sections in halves and bolting or riveting the same together.

Shelves B are alike, except that the shelves intended for the lower ends of the grate-sections are provided with depending lips or flanges b, that overlap and protect the lower ends of the grate-sections. Each shelf extends a short distance under the next shelf above on the same section, and the underlapping edge of each shelf has a slight up wardly-proj ecting riblf that prevents the coal from passing back between the shelves, sub stantially as in the Brightman patent. In

assembling the grates, the grate-sections A and A are placed nearer together or farther apart, according as it may be necessary in filling the lateral space of a furnace with a given number of grate-sections, and consequently the shelves of adjacent sections may IOO overlap each other crosswise of the furnace more or less. (See Figs. 7 and 8.) Apreferable arrangement of the sections is approximately shown in Fig. 8; but if necessary the grate-sections A and A may be placed closer together, thereby making the shelves overlap each other farther laterally; or the sections may be farther removed from each other, as shown in Fig. '7, so that the shelves overlap each other only a short distance.

The shelves of the reciprocating sections A midway of such reciprocations are about midway in the direction lengthwise of the grates of the shelves of the stationary sections, as shown in Figs. 7 and 8, and the reciprocations aforesaid being slight there is never any vertical space between the shelves, and consequently fine coal, or even coal-dust, can be burned Without any waste, while the horizontal spaces between the different shelves give ample room for the draft. The shelves in plan are usually about four inches square;

but the size is not material. For instance, I

- sometimes make shelves six inches long in the direction crosswise of the furnace, so that fewer grates are required to fill a given space. If the size of the shelves is materially changed in the direction lengthwise of the grates, the pockets at will have to be arranged accordingly-that is to say, the pockets would be made closer together or farther apart, according as the shelves were made larger or smaller in this direction. The shelves along the up-' per portions of the sections and the grate-sections A and A should last for many years. The shelves lower down the series will have to be renewed more frequently, according to their respective location, the extreme lower shelves, from their exposed position, being soonest wasted away by the heat.

It is not considered necessary to describe the mechanism for reciprocating the movable sections farther than to say that by detaching a portion of such mechanism the movable sections may be moved rearward far enough to bring the shelves thereof out from under the shelves of the stationary grates, in which case the shelves of the movable sections may be lifted out by hand; also, the movable sections may be moved forward, so as to bring the shelves thereof directly under the shelves of the stationary sections, in which case the latter shelves may be removed. My improved grate, in addition to the movable shelves already described, combines every valuable feature of the Brightman grate described in the aforesaid patent, having the same arrangement of horizontal air-spaces, as aforesaid.

It will be observed that with the Brightman grate, the, shelves being cast onto the sides thereof, the upper edge of the grate proper is exposed to the fire. WVith my improved construction the upper surface of sections A and A is entirely covered and protected by means of the shelves.

What I claim -is- 1. The combination, with inclined grate-sections having pockets, of a series of independently-removable shelves connected with each section and held in the sockets solely-by gravity, the shelves of a series overlapping each other lengthwise of the grate-sections,

and the shelves of adjacentseries overlapping and interlocking each other laterally, with horizontal air-spaces between the different shelves and series of shelves, substantially as set forth.

2. The combination of grate-sections A A, v

having pockets at, with the lower removable shelves, B, having depending shanks b, fitting in pockets a, and depending flanges b, overlapping the lower ends of said grate-sections A A, substantially as set forth.

In testimony whereof I sign this specifica tion, in the presence of two witnesses, this 15th day of February, 1888.

HENRY H. CAMPBELL. Witnesses:

CHAS. H. DORER, ALBERT E. LYNCH. 

